Police in the central province of Binh Thuan are investigating a construction company's workers for suspected negligence in the death of a six-year-old boy who drowned in a construction site pit three days earlier.

On August 31, Nguyen Gia Huy, a first grader in the Bac Phan Thiet Primary School in Phan Thiet City, drowned in a pit in the yard of his school.

Teachers found his body at around 1:30 p.m. while other pupils in the school were taking a nap.

According to police, the school had hired the Quan Trung Trading Limited Company, also the contractor for the newly built school, to fix the broken cesspit.